. >> 20 heartbroken families lost a child in the sandy hook shooting. >> reporter: gun control supporters have become more aggressive. new york mayor michael bloomberg's group released this television ad tuesday. >> i have one question for our political leaders, when will you find the courage to stand up to the gun lobby? whose child has to die next? >> reporter: two years to the day since she was shot and seriously wounded in a mass shooting former congresswoman gabby giffords and her husband, mark kelly, rolled out a new internet campaign and new york governor andrew cuomo will call for his state to pass one of the most restrictive bans on assault weapons. >> gun control, call it what you want, is a highly political, politically contentious situation. >> reporter: connecticut legislature is returning to work nearly four weeks after the sandy hook school shootings. the first order of business debate over tough, new gun laws and sarah brady is speaking out. >> i think it's a very big moment, a huge moment. >> reporter: the wife of jim brady, press secretary to ronald reagan who was shot d